Past Candida infections left me with an overload of acetaldehyde that left me feeling constantly drained, often requiring long naps in the day.
After receiving my iHerb order, I took 500 mg of l-methionine and NAC each and the very next day, I woke up ready to jump out of bed! I went through the day feeling more energetic (but not hyper), and not as though I was "leaking energy". I find that I can take this and / or NAC to achieve this effect, but l-methionine seems to help clear the mind as well.

Having suffered bad hayfever the last couple of days, I had tried vitamin C with only limited benefit. I recalled reading that methionine may help, so I had a cap on an empty stomach at night and started to get relief within 10 minutes. I also slept better than I usually do. This is a well-tolerated product for me and is free of magnesium stearate.
Methionine is an essential amino acid (your body cannot synthesise it) that is required for the methylation cycle; hormones such as serotonin, melatonin and dopamine are produced as a result of this cycle. The B vitamins are also essential for methylation, however in my case, supplemental methionine seems very beneficial and I have been taking a multi-vitamin (plus extra methylcobalamin B12 occassionally) for years.
As with most things, moderation is key. Excess methionine, particularly in the absence of B vitamins can lead to elevated homocysteine, but methionine deficiency can also compromise the methylation cycle, lead to fatty liver disease plus a range of other health issues. Indeed methionine deficiency can also lead to higher homocysteine; here's a quote from Kilmer McCully, one of the pioneers of homocysteine research: 'Methionine deficiency elevates blood homocysteine concentrations because of decreased synthesis of adenosyl methionine and dysregulation of sulfur amino acid metabolism'.

Took b12 injections allmost every day. With L-methionine and Carnitine I need to take b12 only once in the two weeks. I feel a lot better, less tired, less pain. Like the capsules of Twin labs even more, because these are smaller.